package com.abcgz.grade.config;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.abcgz.grade.dao.User;
import com.abcgz.grade.dao.UserDao;

import javax.annotation.Resource;

public class MyShiroRealm extends AuthorizingRealm {
    @Resource
    private UserDao userDao;
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
        User userInfo  = (User)principals.getPrimaryPrincipal();
        return authorizationInfo;
    }

    /*主要是用来进行身份认证的，也就是说验证用户输入的账号和密码是否正确。*/
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token)
            throws AuthenticationException {
        //获取用户的输入的账号.
        String username = (String)token.getPrincipal();
        logger.info(String.format("UserLogin-username:%s", username));
        //通过username从数据库中查找 User对象，如果找到，没找到.
        //实际项目中，这里可以根据实际情况做缓存，如果不做，Shiro自己也是有时间间隔机制，2分钟内不会重复执行该方法
        User userInfo = userDao.findByUsername(username);
        if(userInfo == null){
        		return null;
        }
        SimpleAuthenticationInfo authenticationInfo;
        	authenticationInfo = new SimpleAuthenticationInfo(
                    userInfo, //用户名
                    userInfo.getPassword(), //密码
                    null,//salt=username+salt
                    getName()  //realm name
            );
        return authenticationInfo;
    }

}
